Engineering Essay

595 words - 3 pages

EERI412 Practical 2 Microwave amplifier design

EERI 412
Practical Instruction 2:
Report submission date:
Time required:

Microwave amplifier design – construction
and evaluation of matching network
10 hours preparation / 10 hours execution

1. Background
1.1 Microwave amplifier stub-matching design
The design and implementation of stub networks require more than just the paper
design of a matching circuit. Several practical considerations must be taken into
account, such as the effects of parasitic components on the network.
During the design process the designer must consider all the factors influencing the
design. Sometimes this implies that the designer must follow an iterative process
where the parameters are adjusted until the design is optimal for the application.
1.2 Implementation of a stub-matching network
The design and implementation can be summarized in the following ...view middle of the document...

Integration and evaluation of matching network in an RF system.

2. Definition of problem
You must design and build up a matching network. The network must be designed to
give maximum bandwidth with an acceptably low sensitivity with respect to design

3. Specific instruction
You must work together in groups of 2 to solve the problem, but each person MUST
hand in a separate report discussing your own findings – NOT longer than 5 pages.
Each person must make his/her own conclusions (although you may cooperate in
finding the solutions). Under no circumstances may one person be alone in a group,
or three or more persons work together.

Practical 2



EERI412 Practical 2 Microwave amplifier design
Work at 500 MHz in a 50 Ω system. Do the following specific work with deliverables
as indicated:
1. Design a SINGLE-STUB matching network to match a load of j50Ω to
provide an input impedance of 15 + j60Ω. Start at the load (50Ω) and
transform the load to give the required impedance;
2. Evaluate the matching circuit in terms of (a) sensitivity with respect to the
length of all cable segments (i.e., adjust each segment and determine the
effect on the mismatch losses), and (b) the bandwidth of the network (you
should use simulations to find sensitivity and bandwidth). You may evaulate a
few points and draw conclusions, or you may use Monte Carlo type analysis
to find a more general answer to the sensitivity question;
3. Build your matching network (using RG174 - 50Ω coaxial cable) for evaluation
in a demonstration session. Also bring Smith charts showing your predictions
of the matching network’s performance so that it can be compared to the
network analyzer results. Prepare your cables in such a way that it can easily
be soldered onto SMA connectors (look on the photos on e-Fundi to see what
an SMA connector looks like);
4. After the practical demonstration, each student must incorporate the
measured results, obtained during the demonstration, with the rest of the
report. The complete report must discuss the design and evaluation and will
serve as a final practical report for the semester (ONLY 5 pages allowed).

Practical 2



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